Question about Dishwashers
The dish washer fills with water but when running there is very little water pressure. The water does not get to the top spinner enough to turn it are wash the soap out of the dispenser. I removed the bottom spinner and the screen under it is cleen is there another filter? If not what else could cause this? Washer fills, cycles and runs fine but does not produce enough pressure during wash cycle to even turn the top wash paddles. I have had it completely apart checking for blockages and found none. The pump and impeller are in good condition as this unit is about 14 months old. Could this be the capacitor on the motor or is it bypassing pressure through a valve somewhere? Everything "looks" fine - what am I missing?
D/w's have a fill valve that allows hot water into the tank, a safety float and switch that will cut the power to the fill valve if the water level inside the d/w gets to high. The motor and pump has impellors inside itself that pushes the water into the spray arms and also pushes the water out for the drain cycle. The spray arms turn to "swoosh" the water around inside the tank. Dishwashers need D/w's have a fill valve that allows hot water into the tank, a safety float and switch that will cut the power to the fill valve if the water level inside the d/w gets to high. The motor and pump has impellors inside itself that pushes the water into the spray arms and also pushes the water out for the drain cycle. The spray arms turn to "swoosh" the water around inside the tank. Dishwashers need hot water to dissolve the soap properly ( at min 120 degrees F but the closer to 140 degrees F the better ) You can and should check this inside the dishwasher. They also need dry ( granular ) new soap, liquids work good as well. Rinse aid ( like Jet-dry ) is important to help prevent spotting and also helps the dry cycle work better.
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This is often the fill valve. You can test the fill valve coil for continuity with a ohm meter, no needle movement = bad fill valve. You can also test the fill valve for 120 volts at the fill valve with a volt meter, power there and no fill = bad fill valve. No 120 volts there, you will have to trace power back to find the trouble maker. Test things like the float and float switch, wires and timer. Fill valves are very bad for working once or twice and then quitting, if your dishwasher fills the first and second fill cycles and then no more water through the rest of the cycle, replace the fill valve. You will need to remove the access panels to get at the fill valve. Dishwasher fill valves also have a screen built into the valve entrance, this can also get all clogged up and need to be cleaned.
Inside many dishwasher pump assemblies is a screw that goes through the upper impellor and screws directly into the motor shaft. Since the motor shaft and screw are made of metal...you guessed it...they can / will rust. The screw can rust and become very tight and difficult to remove!! These screws are normally a right ( regular ) hand thread, socket or nut driver can be used to remove the screw. One hard thing to do is to hold the impellor still so the screw can be removed, they often just turn together. The impellor may be jammed with a screwdriver to hold it still so the screw can be removed...sometimes the impellor can be help still by placing a rag on it and hold tight with your hand, the rag will help prevent a sharp edge on the impellor from cutting your fingers. The odd time that screw is too rusted into place, soaking a little rust buster or 3in1 oil on it over night may help loosen it. Sometimes trying to tighten the screw a little at first will help break it free. There are some tool ( see below ) that can be purchased to help hold the impellor still so the screw can be removed, these are only for a few models and pump assembly styles.
WLP seal tool helps center and install the pump seal
Frigidaire seal - impellor remover and install tool
Once the screw is removed, the next obstacle is the impellor can also get stuck onto the motor shaft. Many times I have to break off the old impellor. A sharp blow straight down with a hammer and flat screwdriver will often crack the plastic impellor...careful not to damage the pump body! If the motor shaft has indeed rusted, clean it up really good with sand cloth.
Posted on Dec 04, 2008
For best dishwashing results, set the temperature control of the water heater to no less than 140 degrees Farenheit. Water cooler than this usually doesn't get the dishes clean, unless your dishwasher is a newer model that preheats incoming water. The water shutoff for the dishwasher is typically located below the adjoining sink.
Posted on Dec 04, 2008
Check the float switch inside the tub, it should move freely up and down.
Check the harness to the motor
Check start capacitor on the left side of the wash motor
Posted on Dec 04, 2008
spray arm at the bottom of your dishwasher--it may have a tall spray
tube mounted to the center of it. There may also be a spray arm located
directly beneath the upper rack of dishes and/or above the upper rack.
If debris is blocking the holes in the spray arms where the water comes out, it could cause cleaning problems. Regularly inspect each of the spray arms and clean out the holes as necessary.
Posted on Dec 04, 2008
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Posted on Jan 02, 2017
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If you are noticing that the dishes are not clean, then there are a few things to check for. Check the soap powder if it's kept in a dry environment. Also try replacing the powder with something like a gel or liquid. Next thing to check for is the water pressure and fill valve. Check if the water is filling in and the spray arms are throwing the water with enough pressure. Try and listen to the sound if you hear a proper spraying action sound.
If it seems as a low water pressure then check the fill valve. Now, check if dishwasher is draining the water or not. While the dishwasher is working check whether the dishwasher is draining and there is not much left out water after the cycle is complete. Try cleaning the spray arm with a soft brush. The water temperature plays a major role in cleaning of dishes. The temp should be between 125 and 150 F for dishwasher to clean the dishes. Hope this helps... Please post back if you need more informatiion.
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